Some general grammar and style fixes in the book
Merge remote-tracking branch 'upstream/2.3' into general-grammar-and-style-fixes

Conflicts:
	book/forms.rst
Fixes incorrect latin abbrev
Some more fixes after proofreading
minor #4679 General grammar and style fixes in the book (frne)

This PR was merged into the 2.3 branch.

Discussion
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General grammar and style fixes in the book

Contains numerous grammar, style and readability fixes (see diff)

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | >= 2.3
| Fixed tickets |

Commits
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86d7a6d Some more fixes after proofreading
5c754e0 Fixes incorrect latin abbrev
7e4904f Merge remote-tracking branch 'upstream/2.3' into general-grammar-and-style-fixes
1da061c Some general grammar and style fixes in the book